Crystal growth and crystal structure of KTb(CrO 4) 2

• Published in: Journal of solid state chemistry 1990-03, Vol.85 (1), p.83-87
• Main Authors: Bueno, I., Parada, C., Hermoso, J.A., Vegas, A., Marti´nez-Ripoll, M.
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Inorganic compounds; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Water, oxides, hydroxides, peroxides
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/S0022-4596(05)80063-5

Single crystals of TbK(CrO 4) 2 were grown hydrothermally from a mixture K 2Cr 2O 7 and Tb 2O 3 (molar ratio 10:1) at 127°C. They are orthorhombic, P212121, with a = 13.804(5), b = 5.735(1), c = 9.029(3)Å, Z = 4.The structure, different to the one observed for other members of the series LnK(CrO 4) 2( Ln =La, Eu),consists of CrO 4 tetrahedra (mean Cr O distance 1.66A˚) and TbO 8 bicapped trigonal prisms (mean Tb O distance 2.40A˚) sharing corners and forming large channels parallel to the baxis, where the K atoms are located. The structure can also be described as a distorted CsCl-like arrangement where Tb and K atoms occupy alternate positions of the Cs substructure. The compound could be formulated as (Tb,K)(CrO 4).